Definitely check out Tenba. I had been considering them for a while when I finally got to a camera store that had them in stock. Even though I didn't walk out with anything, I was impressed with the padding and overall build quality. They're not as cheap as some bags, but you can definitely tell that the quality is there.
Tenba - Backpacks
It sounds like to me that either a Shootout Mini or Small would work for you. The mini doesn't have a laptop compartment, but the small does. The Shootout daypack is about the same size as the Shootout small, but it has a zip-out pouch on the back that allows you to carry other stuff like jackets, food, etc.
Even if the backpack has a laptop compartment that you don't need, you can still use the compartment for other things.
I've got the Shootout Mini on order with Adorama and I'm hoping to get it sometime next week.
HTH,
Heather